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Biochemistry - MCQ Practice Questions

Practice free Biochemistry multiple-choice questions with detailed answers and explanations. Perfect for competitive exam preparation.

278 questions | 100% Free

Q.21Easy

Trypsin cleaves peptide bonds on the carboxyl side of which amino acids?

Q.22Medium

In competitive inhibition, which statement is accurate regarding the Lineweaver-Burk plot?

Q.23Easy

Which structural feature is responsible for the high specificity of enzymes?

Q.24Medium

How many hydrogen bonds typically stabilize an alpha-helix per turn?

Q.25Easy

Which amino acid is most likely to be found in the interior of a globular protein?

Q.26Hard

In non-competitive inhibition, what is the graphical representation on a Lineweaver-Burk plot?

Q.27Medium

Which cofactor is essential for the catalytic activity of aldolase?

Q.28Medium

What is the primary function of chaperone proteins?

Q.29Easy

Which enzyme is responsible for breaking glycosidic bonds in starch?

Q.30Hard

In the Michaelis-Menten equation, what does Km represent when Km >> [S]?

Q.31Medium

Which post-translational modification is crucial for the activation of digestive enzymes?

Q.32Easy

What is the Km value indicative of?

Q.33Easy

Which type of enzyme catalyzes the transfer of functional groups between molecules?

Q.34Medium

In protein denaturation, which level of protein structure is disrupted first?

Q.35Hard

Which of the following is a characteristic of an enzyme with negative cooperativity?

Q.36Medium

What is the primary role of the disulfide bond in protein structure?

Q.37Medium

Which amino acid is known to stabilize beta-sheets through side-chain interactions?

Q.38Hard

In the context of enzyme kinetics, what does the term 'turnover number' (kcat) represent?

Q.39Hard

Which structural domain in serine proteases is responsible for substrate recognition and binding?

Q.40Medium

Which of the following enzymes requires a metal cofactor for its catalytic activity in the citric acid cycle?